oh im definitely changing the pump while its down. ive done several of the f series modular pumps and i hate it more every time. the crappy thing is im probably gonna have to do the exact same thing to the rear tank cause it doesnt work either. but idk if thats a power problem or if the pump is actually bad

 

so it turned out that we were all wrong. transmission overdrive solenoid was stuck and was boggin down the engine.

 

The only problem is that there is no such thing as a transmission overdrive solenoid.

 

whatever you would like to call it, its the transmission causing the issues. not fuel. the transmission overdrivve solenoid may not be the technical name for it, but its a solenoid none the less.

 

Just curious. Did the "beeping" stop?

 

et miller is probably referring to the convertor lock up solenoid . That is what I get out of it . GM had lots of issues in the 90's with them causing engine shutdown at stops , to restart and run fine after cool down . The convertor solenoid would overheat , stick , and keep the convertor fully locked . Like not pressing the clutch at stop ! We use to just unplug them and wire in an old fuel injector, to fool the ecm into thinking the solenoid was still there , to keep off the engine lamp .The plug was external , easy "fix " on them .

 

He never said what transmission he had only that it was a 1994 4.9L engine.
So I would guess that he has a E4OD transmission because I think the 4R70W transmission was only put behind the 5.0L engine.
That being the case I guess then you may be right that it was the TC clutch solenoid in the solenoid pack and he changed the solenoid pack to fix it. But the transmission and computer do not sound any series of codes.
Overdrive use more than one of the shift solenoids so that would not be what he was talking about.



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ok ill make it a little clearer. i have not replaced the solenoid yet. but i know that is whats wrong. hold the overdrive "off" button in and it smooths out and doesnt stall. i have to price it and locate one before i can completely fix the issue. as for the beeping, let me set the story for yah. i got this truck from my grandfather, who is a jerry riggin king. the air bag light kept comin on and it annoyed him. so he put a piece of duct tape on it. then that wasnt good enough so he took out the bulb to make it stop blinking. then it beeped. so he bought a new truck instead of takin it to be worked on. so i put a new peanut bulb in it and the beeping stopped, but the blinking started.

 

Not on topic, but I posted fun about using vinyl electrical tape to cover the CEL. I never thought someone would go as far to "Actually" do that. Most just remove the bulb, others do it before and after inspections... I'll remember this for later use when the "beep" rears its ugly head. Thanks for keeping us posted on your progress and solutions.

 

As far as the air bag light it flashing out a code that can tell you what is wrong.

Are you saying you hold the OD button in all the time you drive it or are you just pushing it once to turn the OD off?

 

well i use it as designed to turn the overdrive off and just push it in once. i noticed on a test drive yesterday though, it kicked the overdrive back on after i had disabled it. i tried to push the button and it lit while depressed, then turned off. so i held it in and the engine smoothed out, and drove fine. only while it was held in.

 

ok, even newer update. the truck is becoming more and more touchy about when it wants to fail, and how it is failing. i found that after i unwrapped one of the wiring harnesses, that pressure on the top of the pcm end of the harness would make it fail, come to find out theres a wiring issue. havent quite figured out what its doin, no nicks or cuts, no shorts or opens in the wire. i shielded it and that part stopped. but. sometimes if i dont mess with the OCS, it will drive fine until i touch it, and only when i put too much pressure on it. weird..i know. other times if you push it when you start the engine, and dont mess with it, it'll fail about 10 minutes into the drive. which at this point ive installed a switch to make the contact and hold the 12vdc at the pcm. its only supposed to be momentary. other times, ive found 12vdc on the green and white wire coming from the OCS without the switch engaged, again a gremlin. any ideas, anyone heard or seen such things in a ford before?

 

So it dawned on me how remarkably crazy this whole issue is to even imagine. Would anyone be able to possibly help troubleshoot if it video taped it and posted how/when its failing? It's pretty random when it happens, and doesn't always act the same way.

 

Have you checked all your grounds ? I see bad grounds cause issues often . Some ground issues can be real strange . Just a thought . Lots of people fixate on power and forget that proper grounding is just as important .

 

Yes, ive checked all of the grounds, repeatedly. That's normally the first place i'd look to. What really gets me is how spastic the truck is. Its never the same thing twice in a row. From when I drive to base in the morning, and leave in the evening, its never the same way of presenting the gripe. holding voltage across the overdrive cancel switch fixes it....but why?